Don't poll the current time more than once a second for updates.

ProtocolLib/src/main/java/com/comphenix/protocol/ProtocolLibrary.java

@@ -547,7 +547,7 @@ public class ProtocolLibrary extends JavaPlugin {
 					updateConfiguration();
 					
 					// Check for updates too
-					if (!UPDATES_DISABLED) {
+					if (!UPDATES_DISABLED && (tickCounter % 20) == 0) {
 						checkUpdates();
 					}
 				}